Answer: B) demand determined.
Step-by-step explanation:
If the supply of a good is fixed or the product is of a unique kind, the price of the good will be determined by the amount of demand for it.
Normally supply can change based on the quantity demanded which will impact prices but if the supply is definite, this means that the supply curve is inelastic and the only curve that can affect price therefore is the demand curve.
If more people demand the good, it will increase in price and if less people demand it, it will fall in price.